how to pair bluetooth phone with passat highline?

i bought vw passat highline 2.0 saloon 2009, on the steering wheel there is a switch marked phone but probably for phone function with blue tooth pairing, but cant finding how to do that or even if i have blue tooth in my car or not. can someone help me to hoe to find that if i have blue tooth in my car or if yes then how to pair my phone with it, many thanks in advance..